Geom.bar together with xmin, xmax

[Rudi79]

It seems that gadfly struggles to detect ymax automatically when using Geom.bar together with
xmin, xmax. To see this compare p and p2.

using Gadfly, DataFrames
a=["A","B","C","D","A","C","D","B"]
b=[1,1,1,1,2,2,2,2]
c=[ 12059, 57263, 79003, 13125, 25268, 13291, 17365, 30154]
dt = DataFrame(A=a, B=b, C=c)
dt[!,:xmin] = dt.B .- 0.4
dt[!,:xmax] = dt.B .+ 0.4
p= plot(dt, xmin=:xmin, xmax = :xmax, y =:C, color = :A, Geom.bar(position=:stack))
p2= plot(dt, x=:B, y =:C, color = :A, Geom.bar(position=:stack))

[Mattriks]

I see what you mean. It looks like in plot p that ymax is being determined from maximum(dt.C), not the stacked max.
Workarounds include:

• p = plot(..., Coord.cartesian(ymin=0, ymax=2e5))

•        using Gadfly.Compose
         p2 = plot(..., Theme(bar_spacing=0.2cx))

[Rudi79]

Thank you for the quick reply. Right now I am using your first workaround.
Unfortunately, I was not able to get your second workaround to work with x being Dates.

[Mattriks]

For Dates, Theme(bar_spacing= ) can be plot width/height units, or absolute units, but not plot context units (info about units in Compose). For example, with Dates doing bar_spacing=Day(6)*cx errors in Compose, and bar_spacing=2mm is fine.

[Mattriks]

PR #1446 will fix the first problem above. The second issue (bar_spacing as a Dates.Period type) is an issue involving Compose and/or Base.Dates (i.e. Dates doesn't provide all the maths ops needed to make Compose work for values of type Period.

[Mattriks]

I think the second issue here has been fixed by GiovineItalia/Compose.jl#409, which introduced new size units: sx, sy.
These will be documented in Gadfly sometime (#1480). To use sx, sy, you'll need to ]add Compose#master.
@Rudi79 can you please test for your plot with Dates.

using Dates, DataFrames, Compose, Gadfly
set_default_plot_size(4inch, 4inch)

D2 = DataFrame(A=["A","B","C","D","A","C","D","B"], B=repeat([Date(1990,1,1), Date(1990,2,1)], inner=4),
 C=[12059, 57263, 79003, 13125, 25268, 13291, 17365, 30154])

p3 = plot(D2, x=:B, y=:C, color=:A, Geom.bar(position=:stack), Theme(bar_spacing=Day(6)*sx))